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05 October 1997 <br /> AGE-NC Project No 95-0144 <br /> ' Page 3 of 4 <br /> 4 0. SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> ' • Ground water elevation showed a slight increase during the third quarter of 1997 This is <br /> consistent with seasonal variations at the site as well as with findings at other sites in the <br /> Stockton area <br /> • The highest concentration of dissolved TPHyg continues to be detected in MW-1, near the <br /> former UST excavation <br /> • The highest concentration of dissolved TPH-d was detected in MW-2, near the former UST <br /> 1 excavation <br /> • Petroleum hydrocarbon concentrations detected in the water samples from the site have <br /> decreased over the last three quarters, and were at the lowest concentrations for many of the <br /> analytes of interest during the August 1997 monitoring event <br /> • Petroleum hydrocarbons were not detected in samples collected from MW-4, MW-8, MW- <br /> 1. 11, MW-12 or MW-18, located cross-gradient and down-gradient of the formes UST <br /> location Low concentration of TPH-d was detected in MW-13, located approximately 100 <br /> feet up-gradient of the former UST location <br /> • The dissolved hydrocarbon plume at the site does not appear to be migrating <br /> 5 0. RECOMMENDATIONS <br /> ' Based upon data obtained during the August 1997 and previous sampling events, AGE recommends <br /> t <br /> the following <br /> ' A revised Corrective Action Plan (CAP),which was prepared by AGE on 28 February 1997, <br /> reconnmended removal of hydrocarbon-impacted soil at the former locations,of UST No 1 <br /> and UST No 8 and allowing natural attenuation in the area of former UST Nos 3-6 Upon <br /> approval of the CAP by the PHS-EHD, the recommendations should be implemented <br /> • The next quarterly monitoring should be scheduled for November 1997, concurrent with <br /> ' monitoring at the Van Buren site <br /> Advanced GeoEn ironntental,Inc <br />